Numbers 10:6-8

New American Standard Bible

⁶ Then when you sound an alarm the second time, the camps that are pitched on ^(A)the south side shall set out; an alarm is to be sounded for them to break camp. ⁷ When convening the assembly, however, you shall blow the trumpets without ^(B)sounding an alarm. ^8 (C)The sons of Aaron, moreover, the priests, shall blow the trumpets; and this shall be a permanent statute for you throughout your generations.